the db drive okur K9 12'' has the same t/s specs as an audiopulse revo but is +/- 3bd more efficient this is a great sub especially for 165 on amazon you can ask audiophill about this he will confirm.
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I was told that they are pretty good subwoofers. I heard that if you must warranty one, they are usually denied and claimed as user damage. <-- this usually is the case I would imagine, so I know why they say that. But tough warranty department anyways.
DB drive wire is really good wire, dude up top has lost his mind because its not Hifonics
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To find sealed resonance
resolve Vas/28.32 =
result of that divided by Vb( box volume)
result of that +1
square root that result
result of that multiplied by FS
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db drive
im intrested in buying there 15inc k9 subs but i dont know enough about them
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